Malicious PDF — malware analysis report

Static analysis result for SHA-256 927ab2724421aab9…

MALICIOUS

PDF

76.9 KB Created: 2021-03-02 01:51:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 1651e557bdaf1f36cdb712931af3e0c4 SHA-1: ec87350cfee0b553a2f41807c4df501380896198 SHA-256: 927ab2724421aab9760e582f08d800c733f20f99182e0e4d45a57f2263df462c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to other PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs, including one that appears to be a download lure, point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/123?utm_term=chemistry+if8766+periodic+table+worksheet+answer+key PDF link annotation
    • https://xutafutixon.weebly.com/uploads/1/3/4/5/134576274/2baba2c69e.pdfIn PDF document text
    • https://sajakuvidosub.weebly.com/uploads/1/3/4/4/134496924/wijotesekal.pdfIn PDF document text
    • https://jupolojujilozas.weebly.com/uploads/1/3/4/5/134598947/jezatujasuku.pdfIn PDF document text
    • https://mujamixoto.weebly.com/uploads/1/3/0/7/130776872/punemafeg.pdfIn PDF document text
    • https://cdn.sqhk.co/muwesisokim/bfjaict/53237573197.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/jghhxup/12441998265.pdfIn PDF document text
    • https://noxazevoda.weebly.com/uploads/1/3/5/3/135348256/tisuw_xidufukapevow.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvapipitol/PAgeVgh/screen_time_iphone_parental_control.pdfIn PDF document text
    • https://werevofapopaja.weebly.com/uploads/1/3/4/4/134492388/17dfc5.pdfIn PDF document text
    • https://buxexemap.weebly.com/uploads/1/3/4/8/134890763/8c65a519.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/clumsy_ninja_cheats_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/how_high_should_my_end_table_be.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/lezejelafozosatotideri.pdfIn PDF document text
    • http://kotafonapajawut.epizy.com/facilitative_leadership_agenda_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/7791793079.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD978 6128 bytes
SHA-256: b8ec18929cc97c50115ccde51e38c96e2d09c2fb495c19d9df4eda0bf0dea0da
font_01_sfnt_off0000ee32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 6900 bytes
SHA-256: 093817280c714aa667926a3420de0a4a6e9e39227dc593ef326c3d4c1700b325
font_02_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 10800 bytes
SHA-256: 73aca465e23cb80391c514f308bae8cc82ef6065a413b8e18d48e16f030daf4a

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